Fill in the missing numbers along the sides of the triangle so that it contains each of the numbers from 4 through 12 exactly once. Furthermore, each side of the triangle should contain four numbers whose sum is 32. The pair of numbers that can be used for A and B is numbers that can be used for C and D is that can be used for E and F is (Use a comma to separate answers as needed.) B A 8 4 EF the pair of and the pair of numbers D 12